Heating-furnace.



PATBNTED MAY 8-, 1906.

HEATING FURNACE.

A D. s. RIGHARDSON.

PATENTED MAY 8, 1906.

D. S. RICHARDSON. HEATING FURNACE.

APPLIOATION FILED 001. 22, 1904.

2 SHEETSSHEET 2.

W4? 8 0mm? ITNITED STATES PATENT OFFICE.

DWIGHT S. RICHARDSON, OF NEW YORK, N. Y.

HEATING FURNACE.

Specification of Letters Patent.

Patented May 8, 1906.

Application filed October 22,1904. Serial No. 229,595.

clear, and exact description of the same, reference being had to theaccompanying drawings, forming a part of this specification, and to theletters of reference marked thereon.

This invention relates to heating-furnaces, and more especially to theconstruction of the fire-pot and its associated parts, the objects ofthe invention being to increase the radiating-surface of the fire-pot,prolong the service-life of the pot, reduce the cost of production, andprovide a structure which may be shipped conveniently without danger ofbreakage.

The invention consists, primarily, in a castiron fire-pot in the form ofan integral castmg, having its wall of substantially uniform crosssection to permit of expansion and contraction without distortion orbreakage due to excessive variations in temperature, and a series ofvertical or substantially vertical radially-arranged radiating-flangescontacting along their inner edges with the outside of the fire-pot, butnot integral therewith.

The invention further consists in a castiron fire-pot having its wallvertically corrugated and vertically extending radiatingflangesremovably secured to and with their inner edges contacting with theouter face of the fire-pot.

The invention further consists in certain novel details of constructionand combinations and arrangements of parts, all as will be nowdescribed, and pointed out particularlyin the appended claims.

Referring to the accompanying drawings, Figure 1 is a view of a furnaceembodying the present invention, the casing being removed. Fig. 2 is aperspective view of the fire-pot and ash-pit. Fig. 3 is a-detailvertical section radially of the fireot. Fig. 4 is a detail verticalsection on the ine 4 4, Fig. 3.

Similar letters of reference in the several figures indicate the sameparts.

In so far as the general construction of the furnace is concerned it maybe of any preferred or usual type, and for the pur oses of illustrationI have adopted a well known type of hot-air furnaceembodying an ashpitA, a combustion-chamber or dome B, between which and the ash-pit thefire-pot to be presently described is located. Above thecombustion-chamber is a drum-or radiator C, the whole of these partsbeing inclosed'in a casing which in the drawings is shown broken awaywith the exception of a small section at D. In this particular furnacethe combustion-chamber B and ash-pit A have forward extensions 6 and (1opening out at the front of the casing and constituting the openings forthe admission of fuel and the withdrawal of ashes, said openings beingadapted to be closed by the usual doors.

The fire-pot of the furnace holding, as it does in use, the mass ofincandescent fuel constitutes the hottest part of the structure, andtherefore its exterior surface is the most direct and efiicientradiating-surface. Heretofore many efforts have been made to increasethis radiating-surface but in the practical solution of the problem manydifficulties have been encountered. The difliculties heretoforeencountered are overcome in the present invention, and the fire-potitself (lettered F in the accompanying drawings) is cast in accordancewith the best modern practice, usually in a single uniform casting,although, as usual, it may be in several rings one above the other, theupper edge being provided with a flange and seat f for the lower edge ofthe dome or combustiomchamben Arranged radially around the fire-pot area series of radiating-plates G, preferably cast separate from thefire-pot, but mounted with their inner edges in contact with theexterior surface of the pot, so as to be heated by conduction from thepot itself. These radiating plates or flanges are preferably relativelythin and have lateral vertically-extending ribs g, which serve to vastlyextend their surface area. The inner edges of the plates conform to thesurface contour of the fire-pot, so as to make close contact therewith,and the contacting-surface is increased by widening or forming an edgeflange g thereon. Various means may be employed to retain the plates orflanges in place, an eflicient, cheap, and convenient means consistingof lugs H on the fire-pot, located below and braced by the flange f andcooperating lugs H on the plates or flanges, through which-lugstransverse pins I are passed to hold the flanges in place and draw theirinner edges against the surface of the fire-pot.

The radiating plates or flanges are arranged around the flre-pot in thepath of the air passing up within the casing, but are preferably omittedfrom the front of the pot where the ash-pit and fuel extensions arelocated, so as to permit the air. to circulate freely across the frontof the fire-pot. As shown, the fire-pot is of the ordinary corrugated tye and the inner edges of the flanges are usua ly arranged to fit in thedepressions or hollows, as shown. The number of radiating plates orflanges is optional, and in practice it is customary to employ arelatlvely large number and to make them of sufficient width to extendout into proximity to the casing in order that every part of theascending arm may be brou ht into intimate relation to a surface whichis heated by conduction.

In shipping a furnace embodying the present invention the radiatingplates or flanges are packed separate from the fire- 0t and are mountedon the fire-pot after the atter is set and the work so far finished thatthere is little or no danger of breakage by the workmen setting theother arts of the structure. Sufficient space is le t between the inneredges of the flanges to permit of the insertion of the holding-pins.Thus each plate or flange is separately mounted and each may be removedbr renewed should occasion require without disturbing any of the others.

It will be noted that with the present invention the fire-pot is free toexpand and contract uniformly. Thus the pot is not cracked or broken, asexperience has demonstrated will be the case where radiating flanges orprojections are cast integral with the pot, so as to make the wall thickat the flanges or projections and thin between the same. Furthermore,all danger of the parts being broken during transportation is overcome,and the cost is no greater than that of the ordinary fire-pot plus thecost of casting the separate radiating plates or flanges, and the latteris a simple and inexpensive proposition, especially where, as is usuallythe case, the plates or flanges are duplicates and may be cast from asingle pattern or gate of patterns.

Aside from the fire-pot construction I do not wish to be understood aslimiting the invention claimed to the particular type of furnace adoptedfor illustration, and hence in the claims, where a furnace of thecharacter described is referred to, it is to be understood as meaningall heating-furnaces of this general class where the fire-potconstitutes or may be made to constitute a radiator heated byconduction.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination of a fire-pot, vertical radiatinglates arrangedradially with respect to t e fire-pot and means for suspending theplates in contact with the outer surface of the fire-pot, saidsuspending means being connected with the said plates above and on thefire-pot side of the center of gravity thereof, whereby said plates willbe held by gravity in close contact with said fire-pot.

2. The combination of a fire-pot, vertical radiating-plates arrangedradially with re spect to the fire-pot and means interposed between thetop portion of the fire-pot and plates for suspending the plates incontact with the outer surface of the fire-pot, said suspending meansbeing connected with the plates on the fire-pot side of the center ofgravity thereof, whereby said plates will be held by gravity with oneedge in close contact with the fire-pot.

DWIGHT S. RICHARDSON.

Witnesses:

H. T. RICHARDSON, D. RAITT RICHARDSON.

